| Question |
Answer |
| mineral | natural, nonliving solid crystal that makes up rocks |
| luster | the way a mineral's surface reflects light |
| Why is the streak test useful? | Mineral colors vary, but a mineral's streak is always the same color |
| sedimentary rock | rock that forms when sediments are cemented together and harden |
| How do freezing and thawing weaken rocks? | Freezing and thawing water causes weathering by making the cracks larger. |
| igneous rock | rock that forms from molten rock |
| What happens when igneous rocks cool very slowly? | large crystals form - granite |
| What happens when igneous rocks cool very quickly? | no time to form crystals - pumice, basalt, obsidian |
| sediment | an earth material that has been moved from one place to another and layed down onthe surface of the earth |
| fossil | remains or marks of a living thing from long ago |
| metamorphic rock | rock that has changed as a result of heating and pressure |
| what happens when heat or pressure is applied to sedimentary or igneous rock | it becomes metamorphic rock |
| weathering | a gradual wearing away or changing of rock and soil caused by water, ice, temperature changes, wind, chemicals or living things. |
| erosion | the movng of pieces of soil or rock by mechanisms including gravity, wind, water, ice or plants or animals. |
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